public class test2 {
    //计算1/1-1/2+1/3-1/4+1/5 …… + 1/99 - 1/100 的值
    public static void main(String[] args) {
        double sum = 0.0;
        for (int i = 1; i <101 ; i++) {
            if(i%2!=0){
                sum+=(1.0/i);
            }else{
                sum=sum-(1.0/i);
            }
        }
        System.out.println("结果为:"+sum);
    }
}
